Steel susceptible for the flat springs thick up to 6 mm, spring plates etc.
CHEMICAL COMPOSITION:
C
Mn
Si
P
S
Cr
Ni
Mo
V
W
Ti
Cu
Inne
0,65-0,73
0,6-0,9
0,15- 0,35
MAX 0,025
MAX 0,025
MAX 0,4
MAX 0,4
MAX 0,1
-
-
-
-
-
MECHANICAL PROPERTIES:
Mechanical steel properties after annealing or annealing and finished rolling for the product with thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
After heat treatment
Ultimate tensile strength
Rm
MPa
≤ 510
Yield stress
Re (Rp0.2)
MPa
≥ 640
Elongation
A
%
≥ 16
Reduction of area
Z
%
–
Hardness
HV
HV
≤ 200
Mechanical steel properties after cold rolling for the products with thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
Value
Ultimate tensile strength
Rm
MPa
≤ 1140
Hardness
HV
HV
≤ 315
Mechanical steel properties after toughening for the product with thickness of 0.3 mm ≤ t < 3 mm
Property
Symbol
Unit
Value
Ultimate tensile strength
Rm
MPa
1200 – 1700
Hardness
HV
HV
370-580
Effect of the cross-section on steel mechanical properties after toughening
Thickness, mm
0.3 ≤ 0.5
0.5 ≤ 0.75
0.75 ≤ 1
1 ≤ 1.5
1.5 ≤ 2
2 ≤ 3
Hardness HV
485-535
465-515
455-505
445-495
425-475
415-465
Technological treatment processes:
Technological treatment processes
Possible application
Temperature, °C
Hot forming
Forging
–
–
Rolling
+
(1180 – 850)
Treatment
Heat treatment
Quenching
+
815-845/w,o
Tempering
+
(300 – 500)
Precipitation strengthening
Supersaturation
–
–
Ageing
–
–
Annealing
Normalising
+
(800 – 830)
Soft annealing
+
(650 – 690)
Thermochemical treatment
Carburising
–
–
Other
–
–
INTERNATIONAL STEEL GRADES:
ISO
European Union
Russia
~CS 65
ISO 4960: 1999
C67S
EN 10132-4: 2000
~ 68GA
GOST 1071-81
US
Japan
China
~1070
ASTM A 689-97
~S 70 C-CSP
JIS G 4802 1999
~65
GB 1222-84
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